Advertisement
Quick Links
MPC-XU Universal Crossover
For JBL MPC and MPA amplifiers
Owner's Manual and Installation Guide
I. Description
Figure 1. One channel of the MPC-XU
*TD-000082-00*
TD-000082-00
Rev. B
All manuals and user guides at all-guides.com
The MPC-XU is a dual-channel universal crossover filter accessory for use with JBL MPC
and MPA power amplifiers.
The MPC-XU is user configurable to fulfill these functions:
• active crossover
• bandpass filter
• subsonic filter
• ultrasonic filter
The MPC-XU allows independent filtering of the two audio channels. The choices are:
• high-pass filtering (selection of 19 frequencies)
• low-pass filtering (selection of 17 frequencies)
• bandpass filtering (selection of any combination of the high-pass or low-pass frequencies)
Each channel has an electronically balanced input and bypassable low-pass and high-pass
sections. Each filter circuit uses a 4-pole (24 dB/oct) Linkwitz-Riley alignment.
An alternative to the MPC-XU, the MPC-X100 is preset at 100 Hz for use only as a
subwoofer crossover.
The MPC-XU installs onto the amplifier’s input card, where its settings are not easily acces-
sible to the user. This makes the MPC-XU ideal for installed or rental sound systems, since it
practically eliminates the danger of unauthorized tampering with crossover setting or
incorrect crossover output connections, as well as the loudspeaker damage that may result
from such user tampering.
Installing the MPC-XU involves soldering a 10-pin and a 12-pin header into corresponding
holes on the input card, a process that only qualified technical persons should attempt. We
recommend that you enlist an authorized JBL service center to perform the task. See the
installation section of this manual for more information.
Figure 1 shows a block diagram of one channel of the MPC-XU:
Programmable
Linkwitz-Riley
Low-Pass Filter
Programmable
Linkwitz-Riley
High-Pass Filter
1
Advertisement
Related Manuals for JBL MPC-XU
Summary of Contents for JBL MPC-XU
- Page 1 Each channel has an electronically balanced input and bypassable low-pass and high-pass sections. Each filter circuit uses a 4-pole (24 dB/oct) Linkwitz-Riley alignment. An alternative to the MPC-XU, the MPC-X100 is preset at 100 Hz for use only as a subwoofer crossover.
-
Page 2: Installation
MPC-XU fully into the socket holes. Turn the assembly over and solder the MPC-XU in place. Make sure all the header pins are well soldered. Visually inspect for cold solder joints and verify that you have sufficient clearance to re-install the ribbon connector on the top side of the assembly. - Page 3 Figure 3 Figure 4 8 If you need to make any adjustments to the MPC-XU settings or if you need to record them, do so now, because the MPC-XU will be inaccessible once the noise shield is installed and the input panel is re-installed into the amplifier chassis. See Section III, “Programming the MPC-XU,”...
- Page 4 All manuals and user guides at all-guides.com Bypassing the filters To completely bypass the filter circuitry of a channel, set the jumpers on both Jx01 and Jx02 across pins 1 and 2, which are the upper two pins on their headers (see Figure 6). Note: If you neglect to place jumpers on either header, no signal will pass on that channel.
-
Page 5: Typical Configurations
All manuals and user guides at all-guides.com CD Horn Equalization (Boost)—In addition to enabling the high-pass filter at Jx02, if you opt for CD horn equalization you must place a jumper at Jx03 as well. The MPC-XU offers two equalization curves for CD horn correction: •... -
Page 6: Bandpass Filter
CD Horn Equalization Filter Applications: A constant directivity horn requires a 6 dB per octave boost at high frequen- cies to provide a flat frequency response. On the MPC-XU you must use the CD horn equalization in conjunction with the high-pass filter. - Page 7 J201 across pins 1 and 2 to bypass the low-pass filter. Multi-way Crossover System The MPC-XU allows you to set up 3- and even 4-way systems. Of course, this also requires that you use more than one amplifier and more than one MPC-XU. You must feed each amplifier with the same full-range signal and use the MPC-XU to filter the signals in the individual channels.
- Page 8 8:00 a.m. to 5:00 p.m. Pacific Coast Time: (818) 894-8850. In other areas throughout the world: Contact the JBL Professional Distributor in you country. A list of JBL Professional Distributors and U.S. Service Centers can be attained from the JBL Professional website: www.jblpro.com.